inFlow has partnered with Worldline (previously Bambora) to allow you to receive payments via Visa, Mastercard, or Amex. This feature is currently for US & Canadian users only.
You can email invoices to customers to allow them to pay online, or you can activate paid checkout for customers in your Showroom.
And if you're not using inFlow for inventory and order management yet, you can start a free trial at:
https://inflowinventory.com